21002002210031 has 2 divisors, whose sum is σ = 21002002210032. Its totient is φ = 21002002210030.

The previous prime is 21002002210009. The next prime is 21002002210043. The reversal of 21002002210031 is 13001220020012.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21002002210031 - 2¹⁰ = 21002002209007 is a prime.

It is a super-2 number, since 2×21002002210031² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21002002209988 and 21002002210015.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21002002210331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10501001105015 + 10501001105016.

It is an arithmetic number, because the mean of its divisors is an integer number (10501001105016).

Almost surely, 2^{21002002210031} is an apocalyptic number.

21002002210031 is a deficient number, since it is larger than the sum of its proper divisors (1).

21002002210031 is an equidigital number, since it uses as much as digits as its factorization.

21002002210031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21002002210031 its reverse (13001220020012), we get a palindrome (34003222230043).

The spelling of 21002002210031 in words is "twenty-one trillion, two billion, two million, two hundred ten thousand, thirty-one".